My best author believes that every part of the entire body MUST be exercised daily or risk loss of function.
I have seen people use their toes and write letters holding a pen just as skillfully as we use our fingers. I seen one gal open a package of ciggarets, then open a book of matches and light her ciggaret and smoke it with ONLY HER toes with ZERO EFFORT, just as easy as if we did this with our fingers. So I know, we don't exercise our feet/toes a fraction of the capibility.
The art of marshal arts or yoga is an example of how many parts of the body can be made superior when streched and exercised regularly.
There is allot of room for feet health in this modern world of gagjets.